Why are there so many Win 10 updates requiring reboot?

I've set up a new account with administrator privileges (from task manager command prompt) and am gradually moving everything across. I had to take a lot off the old account and store it on my portable drive to make the space.
I know where most things are but I'd like to copy the calendar file from the old account to save entering so many birthdays and shift patterns again. Does anyone know where the file is stored?

And thank you to everyone who has helped so far. I shall sort out the drivers for my printer in due course as advised.

When I'm happy I have the new account working fully, is it safe to remove and delete the old accounts, including the original Administrator?

And can I now turn off Windows updates until Microsoft have announced that they've stopped this happening?

Apologies to throw out so many questions in one thread.

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Disable automatic reboot for updatesWindows 10 seems to like rebooting without my permission - such as when I have a fullscreen game open, and I also miss the notification to postpone. How do I disable this? I don't have windows pro and thus cant use gpedit. The registry keys various...

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